Home additions · Sammamish, WA
Great Room Addition in Sammamish, WA
A large open living and entertaining space.
Great Room Addition in Sammamish, WA
When Sammamish homeowners search for great room addition or a dependable home additions contractor near them, they want craftsmanship that lasts and a crew that communicates. That's exactly what we do. A large open living and entertaining space.
Sammamish plateau homes are often large and family-focused, where additions, kitchens, and outdoor living spaces deliver the most lasting value.
From room additions and bump-outs to second stories and full primary suites, we handle structural engineering and permits up front so there are no surprises.
What's included in your great room addition
A typical great room addition in Sammamish can involve insulation, framing, roofline tie-in, finishes — and we put the full scope in writing so you know exactly what's covered before work starts.
A home addition lives or dies on the connection to the existing house — foundation, framing, and rooflines have to marry seamlessly so the new space feels original.
How much does a great room addition cost in Sammamish?
Most great room addition projects in Sammamish fall between $146,500 – $426,500, depending on the size of the space, the finishes you choose, and the condition of what's already there.
Because every home is different, we don't quote final numbers sight unseen. After a free in-home consultation you get a detailed, itemized estimate tied to your actual home additions project — so there are no surprises later.
Why Sammamish homeowners choose Xion Build
Meticulous job sites and clear daily communication, with respect for your home, your time, and your neighbors.
Transparent, written estimates with no hidden fees — you know what you're paying for before work begins.
Licensed, bonded, and insured in Washington — every project is built to meet or exceed code and backed by a written warranty.
Our Sammamish home additions process
It starts with a free, no-obligation consultation: what you want, the constraints, and a realistic budget range before you commit to anything.
Each phase is inspected and documented, and we keep you updated so you always know what's happening and what's next.
Design and material selections come next, so finishes, fixtures, and pricing are locked in before demolition — no surprises mid-project.
Frequently asked questions
Do you offer free estimates for great room addition near Sammamish?
Absolutely. We provide free, no-obligation in-home estimates throughout Sammamish and the greater Eastside, with transparent, itemized pricing.
How long does a great room addition take?
Timelines depend on scope and permitting. Once the plan is confirmed we give you a realistic schedule and keep you updated as the home additions work progresses.
What should we decide before starting a great room addition?
Your budget range, must-haves, timeline, and any finishes you already love. For home additions work we also review access, existing conditions, and whether permits are required in Sammamish.
Do you offer a great room addition in Sammamish, WA?
Yes. A large open living and entertaining space. Xion Build is a licensed, bonded, and insured home additions contractor serving Sammamish and the surrounding WA communities.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Sammamish.
Related services in Sammamish
Structural tie-in & roofline match
Marry new framing and rooflines cleanly to the existing home.
View detailsFoundation & footings for additions
Engineered footings and foundations for new square footage.
View detailsDining room expansion
Expand or add a formal dining space for gatherings.
View detailsSecond-story addition
Build up to add bedrooms and baths while keeping your lot.
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